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1. MF 3125 TRACTOR - 1637210
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2. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
SECTION DIVIDER 1
Description Comments
. For UK only or any text in English only
SERIAL NUMBERS
..............
. For France only or any text in French only
NUMEROS DE
SERIES
. For Germany only or any text in German only
SERIEN NUMMER
..............
. For Italy only or any text in Italian only
MATR.O NUMERO
..............
. E
NUMERO SERIE
..............
.
Ref 1 Page 1

3. MF 3125 TRACTOR - 1637210
1
16 1513
12
11
4
10
14
27 28
9
8
2526
24
36
2 357
37 33 313
34 29
18 30
38
17
20
21
22
19
23
32
Ref 7 Page 7

4. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
CYLINDER BLOCK - T6.60 ENGINE 7
Item Part Number Qty Description Comments
T6.60 ENGINE
1 3641789M91 1 Kit,Cyl.Block Repairs and replaces 3638332M91
Repairs and replaces 3638406M91
Repairs and replaces 3637003M91
2 1 Block (1)
Not serviced, order REF.1
3 7 Cap (1)
Not serviced, order REF.1
Repairs and replaces 3638406M91
4 748216M1 6 Liner [A] (1)
748215M1 6 Liner [D]
5 733072M1 14 Ring (1)
6 1476108X1 14 Screw (1)
7 746259M1 5 Plug (1)
8 4222017M1 1 Bush (1)
Repairs and replaces 3638093M1
Repairs and replaces 734883M1
9 746259M1 3 Plug (1)
10 746259M1 5 Plug (1)
11 1476282X1 1 Plug (1)
12 736868M1 1 Plug (1)
13 746259M1 1 Plug (1)
14 4222043M1 1 Plug (1)
3637015M1
15 376180X1 1 Plug (1)
16 3638664M1 1 Washer (1)
Repairs and replaces 376196X1
17 747856M91 6 Jet (1)
Repairs and replaces 3637004M1
18 1447763M1 6 Dowel (1)
19 3637005M91 6 Valve (1)
20 1 Body (19)
Not serviced, order REF.19
21 3637006M1 1 Ball (19)
22 748149M1 1 Spring (19)
23 3637007M1 1 Retainer (19)
24 3640868M91 1 Housing [B,E]
25 1447691M1 1 Seal (24)
26 3641224M1 1 Gasket Repairs and replaces 3640867M1
Repairs and replaces 3638520M1
Repairs and replaces 740828M1
27 731947M1 2 Dowel
28 3637008M1 10 Screw [F]
3637008M1 12 Screw [G]
29 3638590M1 2 Screw Repairs and replaces 748175M1
30 745015M1 2 Washer
31 1476192X1 1 Plug
32 3638809M1 1 Screw
33 1650388M1 1 Washer
34 748393M1 4 Plug
35 731996M1 2 Plug
36 3637016M1 2 Plug
37 3638414M1 1 Pin [C]
38 3637077M1 1 Shaft [C]
[A]
SLIP FIT
[B]
WAS 748163M91 USE 3638347M91 WITH 3638590M1 X 2
[C]
USED ONLY WITH LIST YB31245
[D]
PRESS FIT
[E]
WAS 3638347M91 USE 3640868M91 + 3641089M1 + 363700 8M1 (2) + 3640947M1
Ref 7 Page 7

5. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
CYLINDER BLOCK - T6.60 ENGINE 7
Item Part Number Qty Description Comments
[F]
USED ONLY WITH 748163M91/3638347M91
[G]
USED ONLY WITH 3640868M91
Ref 7 Page 7

6. MF 3125 TRACTOR - 1637210
8
1015
1116
14
17
9
13 1226
29
7
20
272821
22
23
24
25
2
41
5
19
3 6
18
Ref 8 Page 8

7. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
CRANKSHAFT, PISTONS AND CONNECTING RODS - T6.60 ENGINE 8
Item Part Number Qty Description Comments
T6.60 ENGINE
1 3637019M91 1 Kit, Crankshaft
2 1 Crankshaft (1)
Not serviced, order REF.1
3 3637020M91 1 Kit, Bearing [A] (1)
3637021M91 X Kit, Bearing [A]
Thickness (-)0.25MM
3 3637022M91 X Kit, Bearing [A]
Thickness (-)0.50MM
3 3637023M91 X Kit, Bearing [A]
Thickness (-)0.75MM
4 3637024M91 1 Kit, Bearing [A] (1)
3637025M91 X Kit, Bearing [A]
Thickness (-)0.25MM
4 3637026M91 X Kit, Bearing [A]
Thickness (-)0.50MM
4 3637027M91 X Kit, Bearing [A]
Thickness (-)0.75MM
5 747128M1 2 Thrust Washer (1)
735742M1 X Washer Thickness (+)0.19MM
6 747129M1 2 Thrust Washer (1)
735743M1 X Washer Thickness (+)0.19MM
7 3637028M91 6 Kit, Conrod
8 1 Rod (7)
Not serviced, order REF.7
9 1 Cap (7)
Not serviced, order REF.7
10 744971M1 1 Bush (7)
11 3637029M1 2 Bolt (7)
12 3637030M1 2 Nut (7)
13 3638796M91 6 Kit, Piston Repairs and replaces 3638460M91
Repairs and replaces 3637031M91
Up to Serial or Engine Number U556220X
13 3640593M91 6 Kit, Piston From Serial or Engine Number U556221X
14 1 Piston (13)
Not serviced, order REF.13
15 1 Pin (13)
Not serviced, order REF.13
16 1476196X1 2 Circlip (13)
Not serviced, order REF.13
17 3637032M91 6 Kit, Piston Ring Up to Serial or Engine Number U556220X
3641316M91 6 Kit, Piston Ring From Serial or Engine Number U556221X
18 748201M1 1 Gear Number of teeth/spines 28
19 2196X 1 Key
20 3638407M1 1 Pulley [B]
3638588M1 1 Pulley [C]
21 748315M1 1 Spacer
22 1447128M1 1 Spacer
23 742536M1 1 Thrust Plate
24 1447207M1 1 O Ring
25 748074M1 3 Screw
26 11940X 1 Woodruff Key
27 1476037M1 1 Damper [C]
28 3638589M1 1 Plate [C]
29 3638590M1 6 Screw [C]
[A]
PRE-FINISHED
[B]
USED ONLY WITH LIST YB31228
[C]
USED ONLY WITH LIST YB31245
Ref 8 Page 8

8. MF 3125 TRACTOR - 1637210
33
22 28
27
16 361 21 34
3715
29
20 3114
3239
5119
50
13
18
12 17
1038
11
3
3
8 9
5
47 4
46
6
741
240
30
48
23 25
49
43
2444
26
4245
Ref 9 Page 9

9. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
CYLINDER HEAD - T6.60 ENGINE UP TO NO U556220X 9
Item Part Number Qty Description Comments
T6.60 ENGINE UP TO NO U556220X
1 3641817M91 1 Kit, Cyl. Head [B]
3638419M91 1 Kit, Cyl. Head [C]
2 3641853M91 1 Kit, Cyl. Head (1)
3 1 Head (2)
Not serviced, order REF.1
4 3640676M1 6 Guide (2)
5 748420M1 6 Guide (2)
6 731354M1 3 Plug (2)
7 746260M1 6 Plug (2)
8 3638546M1 1 Plug (2)
9 3637040M1 1 Plug (2)
10 1476192X1 6 Plug (2)
11 733824M1 6 Washer (1)
12 3637041M1 6 Seal (1)
13 3637057M1 6 Spring [B] (1)
3637057M1 6 Spring [C,D]
740465M1 6 Spring [C] (1)
14 740467M1 6 Spring [C] (1)
15 3637058M1 6 Cap (1)
16 736453M1 12 Cotter [A] (1)
17 733824M1 6 Washer (1)
18 3637041M1 6 Seal (1)
19 3637057M1 6 Spring [B] (1)
3637057M1 6 Spring [C,D]
740465M1 6 Spring [C] (1)
20 740467M1 6 Spring [C] (1)
21 3637058M1 6 Cap (1)
22 736453M1 12 Cotter [A] (1)
23 748387M1 6 Insert (1)
24 748413M1 6 Valve Inlet (1)
25 748410M1 6 Insert (1)
26 748309M1 6 Valve Exhaust (1)
27 1476243X1 2 Screw
28 745662M1 12 Screw
29 745663M1 18 Screw
30 3640916M1 1 Head Gasket Repairs and replaces 3637059M1
31 748368M1 1 Plate
32 3638693M1 1 Joint
33 3637011M1 3 Screw
34 3637051M1 2 Screw
35 3637011M1 1 Screw
36 731410M1 1 Plug
37 376178X1 1 Washer
38 3637045M1 1 Connection
39 3637046M1 6 Screw
40 3641311M1 1 Housing
41 3638702M1 1 Joint Repairs and replaces 748303M1
42 3638546M1 2 Plug
43 3637048M1 1 Screw
44 3637046M1 2 Screw
45 3637049M1 2 Screw
46 1447384M1 2 Thermostat
47 3638700M1 1 Joint Repairs and replaces 748302M1
48 3637050M1 1 Plate
49 3637051M1 2 Screw
50 3638411M1 1 Plate
51 3637053M1 2 Screw
[A]
SERVICED IN PAIRS
[B]
USED ONLY WITH LIST YB31228
[C]
USED ONLY WITH LIST YB31245
[D]
Ref 9 Page 9

10. MF 3125 TRACTOR - 1637210
33
22 28
27
16 361 21 34
3715
29
31
3239
5119
50
13
18
12 17
1038
11
38 9
35
5
47 4
46
6
741
40
30
48
23 25
49
43
2444
26
4245
Ref 10 Page 10

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12. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
CYLINDER HEAD - T6.60 ENGINE FROM NO U556221X 10
Item Part Number Qty Description Comments
T6.60 ENGINE FROM NO U556221X
1 3640596M91 1 Kit, Cyl. Head
3 1 Head (1)
Not serviced, order REF.1
4 3640676M1 6 Guide (1)
5 748420M1 6 Guide (1)
6 731354M1 3 Plug (1)
7 746260M1 6 Plug (1)
8 3638546M1 1 Plug (1)
9 3637040M1 1 Plug (1)
10 1476192X1 6 Plug (1)
11 733824M1 6 Washer (1)
12 3637041M1 6 Seal (1)
13 3637057M1 6 Spring [D]
740467M1 6 Spring (1)
15 3637058M1 6 Cap (1)
16 736453M1 12 Cotter [A] (1)
17 733824M1 6 Washer (1)
18 3637041M1 6 Seal (1)
19 3637057M1 6 Spring [D]
740467M1 6 Spring (1)
21 3637058M1 6 Cap (1)
22 736453M1 12 Cotter [A] (1)
23 3640677M1 6 Insert (1)
24 3640597M1 6 Valve Inlet (1)
25 3640712M1 6 Insert (1)
26 748309M1 6 Valve Exhaust (1)
27 1476243X1 2 Screw
28 745662M1 12 Screw
29 745663M1 18 Screw
30 3640916M1 1 Head Gasket Repairs and replaces 3637059M1
31 748368M1 1 Plate
32 3638693M1 1 Joint
33 3637011M1 3 Screw
34 3637051M1 2 Screw
35 3637011M1 1 Screw
36 731410M1 1 Plug
37 376178X1 1 Washer
38 3637045M1 1 Connection
39 3637046M1 6 Screw
40 3641311M1 1 Housing
41 3638702M1 1 Joint Repairs and replaces 748303M1
42 3638546M1 2 Plug
43 3637048M1 1 Screw
44 3637046M1 2 Screw
45 3637049M1 2 Screw
46 1447384M1 2 Thermostat
47 3638700M1 1 Joint Repairs and replaces 748302M1
48 3637050M1 1 Plate
49 3637051M1 2 Screw
50 3638411M1 1 Plate
51 3637053M1 2 Screw
[A]
SERVICED IN PAIRS
[D]
USED ONLY WITH SINGLE SPRING HEAD ASSYS(LOW SPEED APPLICATIONS)
Ref 10 Page 10

13. MF 3125 TRACTOR - 1637210
25
26
32
29
33
34
27
21
1
28
31
2
3
4 15 30
8
11 10
6
5
14
24
18
7
20
9
17
22
16
1213
19
23
Ref 11 Page 11

14. MASSEY FERGUSON
MF 3125 TRACTOR - 1637210 1637210
ROCKER SHAFT - T6.60 ENGINE 11
Item Part Number Qty Description Comments
T6.60 ENGINE
1 3637060M91 1 Rocker Shaft Ass
2 3637062M91 1 Rocker Shaft (1)
3 1 Shaft (2)
Not serviced, order REF.2
4 731330M1 2 Plug (2)
5 376137X1 2 Circlip (1)
6 747876M1 2 Washer (1)
7 733811M1 4 Spring (1)
8 733812M1 2 Spring (1)
9 3638403M1 6 Bracket (1)
Repairs and replaces 3637063M1
10 3641306M91 6 Rockerarm (1)
Right Hand
Repairs and replaces 733809M1
11 895748M1 1 Bush (10)
12 3641247M1 6 Lever (1)
Left Hand
Repairs and replaces 733810M1
13 895748M1 1 Bush (12)
14 3638499M1 1 Connection (1)
15 3638500M1 1 Screw (1)
16 731516M1 12 Bolt (1)
17 376123X1 12 Nut (1)
18 739513M91 2 Shim (1)
19 3637066M1 4 Stud
20 3637067M1 4 Nut
21 3637068M1 2 Screw [A]
3637073M1 2 Screw [B]
22 733817M1 12 Rod
23 4222069M1 12 Tappet 740671M1
24 376525X1 1 Olive
25 3641896M1 1 Cover 3637069M91
26 3638447M1 1 Connection (25)
27 748329M1 1 Joint
28 745540M1 1 Spring
29 3638598M1 1 Clip Repairs and replaces 1447613M1
30 745489M1 1 Bracket
31 740597M1 1 Pipe
32 3637070M1 4 Nut
33 3638640M1 4 Bush Repairs and replaces 744387M1
34 365691X1 4 Shim [B]
[A]
USED ONLY WITH LIST YB31228
[B]
USED ONLY WITH LIST YB31245
Ref 11 Page 11

15. MF 3125 TRACTOR - 1637210
2
5
15
2014
17
13
12
9
8
22
19
18
21
1
3
4
6
11
7
10
16
Ref 12 Page 12